Alert archive / Georgia / Mesoscale Discussions in 2017
Mesoscale Discussion 1641
The Storm Prediction Center issued this mesoscale discussion at Sep 11, 2017, 8:49 AM EDT for 4 counties in Florida; 13 counties in Georgia; 6 counties in South Carolina. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- Sep 11, 2017, 8:49 AM EDT (12:49 UTC)
- Expired
- Sep 11, 2017, 10:45 AM EDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
All 23 counties
Baker County, FL, Duval County, FL, Nassau County, FL, Saint Johns County, FL, Brantley County, GA, Bryan County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Effingham County, GA, Glynn County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Jasper County, SC
The radar
The Jacksonville radar (KJAX), 128 km from the middle of the area, began a volume at 12:51 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Charleston AFB, SC (KCHS), launched 12:00Z, 0.8 hours before the alert went out and 189 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 547 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 902 m²/s²
- 0-3 km storm-relative helicity
- 1081 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 10:33 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 37 more | 87 min |
| Sep 10, 11:50 PM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Duval, Flagler and 5 more | 14 hr |
| Sep 11, 4:58 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Duval, Flagler and 5 more | 2 hr |
| Sep 11, 1:46 PM EDT | Tornado Watch | SPC | Bryan, Bulloch, Burke, Candler, Chatham, Effingham and 7 more | 10 hr |
| Sep 11, 5:45 PM EDT | Mesoscale Discussion | SPC | Beaufort, Berkeley, Charleston, Colleton, Dorchester | 60 min |
Nearby
Mesoscale Discussions in Georgia, 2017Mesoscale Discussions in South Carolina, 2017Mesoscale Discussions in Florida, 2017Every mesoscale discussion in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.